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Compensation Plans Outstanding Longer Term Incentive Awards (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Outstanding Long Term Incentive Awards [Line Items] |  |
Target Shares Issuable as Long Term Incentive Awards | $ 15,726 | $ 53,767
Maximum Shares Issuable as Long Term Incentive Awards | 31,452 | 66,827
Unrecognized Compensation Cost - Long Term Incentives | $ 862,000 | $ 939,000
Share-based Compensation Arrangement By Share-based Payment Award, Grants In Period, Weighted Average Grant Date Fair Value | $ 50,190 | $ 40,720

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- Definition Maximum Shares Issuable as Long Term Incentive Awards + References No definition available. + Details
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- Definition [Line Items] for Outstanding Long Term Incentive Awards [Table] + References No definition available. + Details
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- Definition Target Shares Issuable as Long Term Incentive Awards + References No definition available. + Details
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- Definition Unrecognized Compensation Cost - Long Term Incentives + References No definition available. + Details
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